.content{
    width: 100%;
    height: 500px;
}

.tipsdiv{
    width: 400px;
    height: 250px;
    margin: 30px auto 0; 
    border: 1px solid #ddd;
    background-color: #d3d3d3;
    border-radius: 5px;
    box-shadow: 0 0 5px #ddd;
    padding: 20px;
    color: red;
}

.btndiv{
    width: 400px;
    height: 100px;
    margin: 10px auto 0;
    background-color: #d3d3d3;
    border-radius: 5px;
    box-shadow: 0 0 5px #ddd;
}

.btndiv button{
    width: 150px;
    margin: 30px 100px 0 120px;
}